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我队在千镜山矿区用大口径钻进复杂地层，由于岩矿层松软怕冲刷，长期来岩矿心采取率低，一般在50％以下。曾用喷反钻具，虽采取率可达要求，但分选严重，层位错乱，品质差。为此，我们根据早期使用的无泵钻具原理，设计了一种分水接头双动双管钻具，应用于施工的二个钻孔，效果较好（见附表）。经地质、水文、物探三家验收，认为岩矿心采取率高，层位准确，品质好，较好地满足了地质设计要求。一、结构原理1．分水接头双动双管钻具与其它双管无泵钻具基本相同，但改进了内管回水装置，并在内管上端加了一根短钻杆（见附图）。
Our team drill into complex formations with large caliber in Qianjianshan Mining Area. Due to the soft and scouring rock formations, the rock mining rate is low, generally below 50%. Have used spray reverse drilling tools, although the rate up to meet the requirements, but the serious sorting, layers of confusion, poor quality. Therefore, according to the principle of pump-less drilling which was used in the early stage, we designed a double action double-pipe drilling tool with splitter, which is better for two drilling holes in construction (see attached table). The geology, hydrology, geophysical three acceptance, that rock core mining rate is high, accurate horizon, good quality, better meet the geological design requirements. First, the structure principle 1. The splitter double action double pipe drill is basically the same as the other double pipeless drill, but the inner pipe backwater is improved and a short drill pipe is added to the upper end of the inner pipe (see attached figure).